A Clean Strategy to Prepare Polylactide/Hydroxyapatite Bionanocomposites via Solid Mechanochemistry

ABSTRACT

Polylactide (PLA) chains were ruptured to generate free macroradicals terminated on the surface of hydroxyapatite (HA) by means of a strong shear stress generated via solid-state shear milling, achieving the solid grafting of PLA on HA without chemical treatment. As a result, the interfacial interaction between PLA and HA and the dispersion of HA in PLA were improved, resulting in significant promotion of the crystallization of PLA and thus PLA/HA composites with higher performance were obtained. This study opened up a new, clean and uncontaminated strategy to prepare PLA/HA bionanocomposites.

KEYWORDS:

• Hydroxyapatite
• interfacial interaction
• mechanochemistry
• polylactide
• solid grafting

Funding

This work was financed by the Chongqing Key Laboratory of Environmental Materials and Remediation Technologies (CEK1412), the National Natural Science Foundation of China (51421061) and the open project of Sichuan Provincial Key Lab of Process Equipment and Control (GK201511).